[GreenKeys] Model 15 + C-64 Baud rate question

[Roy Morgan]

On Jul 4, 2015, at 5:16 PM, drlegendre . <drlegendre at gmail.com> wrote:

> Just came across this.. from a PDF document "TELETYPEWRITERS MADE EASY!"
> 
> ADJUSTING THE RANGE FINDER  
> 
> I didn't realize the receive speed could be adjusted independent of the main motor speed.. need to take a look at the mechanism. 

Be careful - (As I understand it):  it’s not the speed that’s being adjusted, it is the moment when the bit is being sensed (when the selector operates) within each pulse that is being adjusted.  The practical effect when receiving code at a speed somewhat different from what the machine is operating at, is that you get less errors.  

The operating speed of the receiving machine is not being changed.  If you have a governed motor, it seems likely that you can change the actual machine speed, but I have not heard of this. Machines with synchronous motors operate at a fixed speed that is not varied.


> Also, I've been trying to find info on the Range Finder -

Do you have the model 15 “Descripton” or the “Principles of Operation" documents?
144_Model15_Descr_Feb31.pdf
Page 29 and 31 tell briefly about the “Range Finder” function.  There are no doubt more complete descriptions of how this works.  I suggest the Army manual called something like Principles of Teletype Operation or some such.  The “Adjustments” manual for the model 15 I think will help you a lot.  Sorry, I can’t seem to find that manual title here.  See if you can find the army manuyal on the Modle 15,or the navy manual Navships 91240

NOTE:  navy-radio.com has LOTS of manuals online for you to download.
http://navy-radio.com/

Here is one title:
Principles_of_Telegraphy NAVSHIPS 0967-255-0010.pdf
and another:
tm11-655-tty.pdf
This last one has again a summary paragraph and refers the technician to “…manuals which cover teletypewriter maintenance.”

At this link, you can get the following manuals:
www.aetherltd.com/manuals.html

Bulletin	Date	Title	Notes
144	February, 1931	Description, Type Bar Page Printer (Model 15)	Introduction to the classic Model 15 Teletype
138/4	October, 1941	Adjustments, Type Bar Page Printer (Model 15) 	Detailed adjustment and lubrication instructions 
1110B	December, 1943 	Parts, Type Bar Page Printer (Model 15)	Parts list. U.S. Army reprint of Teletype manual. 

Roy


Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958